ProMinent EXtronic EXBb Operating Instructions Manual page 21

Diaphragm rupture sensor
CAUTION!
Uncontrolled flow of feed chemical
Feed chemical may press through the metering
pump in an uncontrolled manner in the event of
excessive priming pressure on the suction side of
the metering pump.
– Do not exceed the maximum permissible pri‐
ming pressure for the metering pump or
– set up the installation properly.
CAUTION!
Warning of backflow
Liquid ends, foot valves, back pressure valves,
relief valves or spring-loaded injection valves do
not constitute absolutely leak-tight sealing ele‐
ments.
– Use a shut-off valve, a solenoid valve or a
vacuum breaker for this purpose.
CAUTION!
Danger resulting from unnoticed diaphragm rup‐
ture
If the pump has been ordered with an electric dia‐
phragm rupture sensor, it still has to be installed.
– Screw the enclosed diaphragm rupture sensor
into the liquid end.
CAUTION!
Warning of unnoticed diaphragm rupture
Only above approximately 2 bar system back pres‐
sure is a signal generated in the event of the rup‐
ture of a diaphragm.
– Only rely on the diaphragm rupture sensor with
back pressures of greater than 2 bar.
Or install a back pressure valve and set it to a
minimum of 2 bar – if the installation permits
this.
Installation, hydraulic
21